WASHINGTON — Set aside the high-pressure task of postseason pitching that Chris Carpenter routinely masters for the St. Louis Cardinals and think about this:

Cardinals' Pete Kozma, right, high-fives teammates David Freese and Daniel Descalso after batting them with on a three-run home run in the second inning of Game 3 of the National League division series against the Washington Nationals.

Even the take-it-for-granted act of breathing feels odd on occasion now that he’s missing a rib and two neck muscles.

Taking the mound for only the fourth time in 2012 after complicated surgery to cure numbness on his right side, the 37-year-old Carpenter spoiled the return of postseason baseball to Washington by throwing scoreless ball into the sixth inning, and the defending champion Cardinals beat the Nationals 8-0 Wednesday to take a 2-1 lead in their NL division series.

“To go from not being able to compete, and not only compete but help your team, to be able to be in this situation,” Carpenter said, “it’s pretty cool.”

Rookie Pete Kozma delivered a three-run homer, and a trio of relievers finished the shutout for the Cardinals, who can end the best-of-five series in Thursday’s Game 4 at Washington. Kyle Lohse will start for St. Louis. Ross Detwiler pitches for Washington, which is sticking to its long-stated plan of keeping Stephen Strasburg on the sideline the rest of the way.

“We’re not out of this, by a long shot,” Nationals manager Davey Johnson said. “Shoot, I’ve had my back to worse walls than this.”

With the exception of Ian Desmond — 3 for 4 on Wednesday, 7 for 12 in the series — the Nationals’ hitters are struggling mightily. They’ve scored a total of seven runs in the playoffs and went 0 for 8 with runners in scoring position and left 11 men on base in Game 3.

Rookie phenom Bryce Harper’s woes, in particular, stand out: He went 0 for 5, dropping to 1 for 15. He went to the plate with an ash bat and no gloves in the first inning, tried wearing anti-glare tinted contact lenses on a sun-splashed afternoon — nothing helped.

“Nothing I can do,” the 19-year-old Harper said. “I just missed a couple.”

All in all, quite a damper on the day for a Nationals Park-record 45,017 red-wearing, towel-twirling fans witnessing the first major league postseason game in the nation’s capital in 79 years. They didn’t have much to enjoy, in part because of the problems created by Nationals starter Edwin Jackson, who was on the Cardinals’ championship team a year ago.

“I didn’t feel like I was out of rhythm. I didn’t feel like I couldn’t throw strikes. I just missed across the plate with a couple of balls and it cost me,” Jackson said.

He gave up four consecutive hits in the second, the biggest being Kozma’s first-pitch homer into the first row in left off a 94 mph fastball to make it 4-0. Kozma took over as the Cardinals’ everyday shortstop in September, replacing injured All-Star Rafael Furcal, and only had 72 at-bats during the regular season.

Angel Pagan led off the game with a home run, Gregor Blanco and Pablo Sandoval connected later and the Giants beat Cincinnati 8-3 on Wednesday, evening their NL division series at 2-all.

Lincecum, the two-time Cy Young winner relegated to the bullpen, also delivered. He entered in the fourth with the Giants ahead 3-2, struck out six while giving up just one run in 4 1-3 innings, and allowed his team to pull away.

“I knew he would play a huge role in this,” manager Bruce Bochy said. “And I know of other situations where starters have been in the ‘pen and really done a great job to help their team win. We knew Timmy would play a critical role in the series like he did tonight.”

The Giants can complete an unprecedented comeback on Thursday. No team has recovered from a 2-0 deficit in a best-of-five series by winning three on the road, according to STATS LLC.

“Thanks to the win today, there will be a tomorrow,” Pagan said. “And we are ready for that.”

Matt Cain, who lost the series opener and has yet to beat the Reds in three tries this season, will start Game 5 against Mat Latos.

The Giants’ hitters emerged from a series-long slump and extended Cincinnati’s playoff misery. The Reds haven’t won a postseason game at home in 17 years.

One thing in the Reds’ favor — they haven’t dropped three straight at home all season.

“I’d like to think that we still have the advantage,” Reds outfielder Jay Bruce said. “We’re at home. I expect Mat to come up with a big game. I’m looking forward to it.”

The Reds were hoping to start ace Johnny Cueto, but had to drop him off the roster a few hours before Wednesday’s first pitch because he was still bothered by a strained muscle in his right side. He won’t be available if Cincinnati wins Game 5 and reaches the NL championship series.

The way the Giants have started hitting, that’s now in doubt.

San Francisco managed only four runs in the first three games of the series. The Giants avoided the sweep by pulling out a 2-1 win in 10 innings on Tuesday night with the help of a passed ball and an error by third baseman Scott Rolen.

They broke out against Mike Leake, who replaced Cueto and had a rough time. Leake threw his first career complete game in San Francisco on June 29 and was 3-0 career against the Giants.

Pagan homered on his second pitch of the game. Blanco hit a two-run shot in the second. The Giants had another breakthrough in the fifth, when back-to-back doubles by Joaquin Arias and Pagan ended an 0-for-14 slump with runners in scoring position during the series.

Sandoval’s two-run shot in the seventh made it 8-3, matched the Giants’ season high for homers and drew loud boos from the crowd of 44,375 — the third-largest at Great American Ball Park. Fans quietly settled into their seats and used their white rally towels as lap warmers against the evening chill.

The Giants normally don’t hit many homers — only 103 during the season, fewest in the majors. They’re only the seventh team since 1900 to reach the playoffs after finishing last in the majors in homers.

While the offense went to work, Lincecum bailed out the bullpen.

Bochy didn’t hesitate to put the guys he wanted on the mound, using four pitchers in the first four innings. Lincecum got the final out in the fourth and kept going, allowing only two hits in his second relief appearance of the series.

Lincecum threw 42 strikes of 55 pitches and even batted twice — just like a starter.

A's 4, Tigers 3

OAKLAND, Calif. — Seth Smith hit a game-tying two-run double off Detroit closer Jose Valverde in the ninth inning and Coco Crisp capped Oakland’s most dramatic comeback yet with an RBI single as the Athletics staved off elimination for a second straight night in Game 4 of the AL division series Wednesday.

The A’s rode 14 walkoff wins in the regular season to an improbable AL West title. Those paled in comparison to No. 15, which set up a win-or-go-home Game 5 against Justin Verlander and the Tigers.

Josh Reddick started the rally with a single just under the glove of diving second baseman Omar Infante. Josh Donaldson followed with a double off the wall in left-center and both runners scored on Smith’s double. Two outs later, Crisp lined a single to right and Smith scored easily when Avisail Garcia couldn’t handle the ball.

Cardinals' Pete Kozma, right, high-fives teammates David Freese and Daniel Descalso after batting them with on a three-run home run in the second inning of Game 3 of the National League division series against the Washington Nationals.

Even the take-it-for-granted act of breathing feels odd on occasion now that he’s missing a rib and two neck muscles.

Taking the mound for only the fourth time in 2012 after complicated surgery to cure numbness on his right side, the 37-year-old Carpenter spoiled the return of postseason baseball to Washington by throwing scoreless ball into the sixth inning, and the defending champion Cardinals beat the Nationals 8-0 Wednesday to take a 2-1 lead in their NL division series.

“To go from not being able to compete, and not only compete but help your team, to be able to be in this situation,” Carpenter said, “it’s pretty cool.”

Rookie Pete Kozma delivered a three-run homer, and a trio of relievers finished the shutout for the Cardinals, who can end the best-of-five series in Thursday’s Game 4 at Washington. Kyle Lohse will start for St. Louis. Ross Detwiler pitches for Washington, which is sticking to its long-stated plan of keeping Stephen Strasburg on the sideline the rest of the way.

“We’re not out of this, by a long shot,” Nationals manager Davey Johnson said. “Shoot, I’ve had my back to worse walls than this.”

With the exception of Ian Desmond — 3 for 4 on Wednesday, 7 for 12 in the series — the Nationals’ hitters are struggling mightily. They’ve scored a total of seven runs in the playoffs and went 0 for 8 with runners in scoring position and left 11 men on base in Game 3.

Rookie phenom Bryce Harper’s woes, in particular, stand out: He went 0 for 5, dropping to 1 for 15. He went to the plate with an ash bat and no gloves in the first inning, tried wearing anti-glare tinted contact lenses on a sun-splashed afternoon — nothing helped.

“Nothing I can do,” the 19-year-old Harper said. “I just missed a couple.”

All in all, quite a damper on the day for a Nationals Park-record 45,017 red-wearing, towel-twirling fans witnessing the first major league postseason game in the nation’s capital in 79 years. They didn’t have much to enjoy, in part because of the problems created by Nationals starter Edwin Jackson, who was on the Cardinals’ championship team a year ago.

“I didn’t feel like I was out of rhythm. I didn’t feel like I couldn’t throw strikes. I just missed across the plate with a couple of balls and it cost me,” Jackson said.

He gave up four consecutive hits in the second, the biggest being Kozma’s first-pitch homer into the first row in left off a 94 mph fastball to make it 4-0. Kozma took over as the Cardinals’ everyday shortstop in September, replacing injured All-Star Rafael Furcal, and only had 72 at-bats during the regular season.

Angel Pagan led off the game with a home run, Gregor Blanco and Pablo Sandoval connected later and the Giants beat Cincinnati 8-3 on Wednesday, evening their NL division series at 2-all.

Lincecum, the two-time Cy Young winner relegated to the bullpen, also delivered. He entered in the fourth with the Giants ahead 3-2, struck out six while giving up just one run in 4 1-3 innings, and allowed his team to pull away.

“I knew he would play a huge role in this,” manager Bruce Bochy said. “And I know of other situations where starters have been in the ‘pen and really done a great job to help their team win. We knew Timmy would play a critical role in the series like he did tonight.”

The Giants can complete an unprecedented comeback on Thursday. No team has recovered from a 2-0 deficit in a best-of-five series by winning three on the road, according to STATS LLC.

“Thanks to the win today, there will be a tomorrow,” Pagan said. “And we are ready for that.”

Matt Cain, who lost the series opener and has yet to beat the Reds in three tries this season, will start Game 5 against Mat Latos.

The Giants’ hitters emerged from a series-long slump and extended Cincinnati’s playoff misery. The Reds haven’t won a postseason game at home in 17 years.